I think there is a check of the resistance of the brake light circuit/brake switch in the bcm or ECM that won’t pass if there are only led’s in the circuit so at least the newer models need a resistor. I think used a 100 ohm resistor.So if I have a resistor wired into my 3rd brake light, I am affecting what is being accomplished by the resistors in my DF button panel?
My current plan is to pull the resistor and check it the next time I can get on the road.
This is independent of the switch circuit.